The problem with current technology is that it requires a battery. These are not small. The heart is just a muscle so of course a mechanic heart can do the same. I thought they had been doing this for far longer tho. One organ that is very hard if not impossible to replace right now is the brain. What mankind needs is a way to copy a brain onto another format or into a host brain. It's just a matter of time. ** When that happens humans will live on forever in one way or another. **

Just before the funeral services, the undertaker came up to the very elderly widow and asked,
'How old was your husband?'
'98,' she replied, 'One year older than me'
'So you're 97,' the undertaker commented.
She smiled and responded , 'Hardly worth going home, is it?

Well actually with this kind of device you don't need a pulse, since it provides constant pressure and blood flow and does not need to rest between beats which are the two main reason why we have heart beats, which BTW are nothing but one of the criteria to tell someone is dead more important is brain wave activity before hear beats and breathing.